package com.example.eliliya.datepicker_dialog;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import android.view.View;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import android.widget.Button;
import android.widget.DatePicker;
import android.view.View.OnClickListener;
import android.app.DatePickerDialog;
import android.widget.Toast;

public class MainActivity_datepickerdialog extends AppCompatActivity {
    private TextView showdate;
    private Button setdate;
    private int year;
    private int month;
    private int day;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_datepickerdialog);
        showdate=(TextView)this.findViewById(R.id.showtime);
        setdate=(Button)this.findViewById(R.id.setdate);
        Calendar c=Calendar.getInstance(Locale.CHINA);
        Date mydate=new Date();
        c.setTime(mydate);
        year=c.get(Calendar.YEAR);
        month=c.get(Calendar.MONTH);
        day=c.get(Calendar.DAY_OF_MONTH);
        showdate.setText("当前日期为:"+year+"-"+(month+1)+"-"+day);

        setdate.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                DatePickerDialog my_datePickerDialog=new DatePickerDialog(MainActivity_datepickerdialog.this,Datelistener,year,month,day);
                my_datePickerDialog.show();
            }
        });
    }
    private DatePickerDialog.OnDateSetListener Datelistener=new DatePickerDialog.OnDateSetListener(){
        public void onDateSet(DatePicker v,int y,int m,int d) {
            Date currentTime=new Date();
            Date date=new Date(y-1900,m,d);
            if (currentTime.compareTo(date) >= 0) {
                year = y;
                month = m;
                day = d;
                updateDate();
            }
            else{
                Toast.makeText(MainActivity_datepickerdialog.this, "设置日期无效", Toast.LENGTH_SHORT).show();
            }
        }
        private void updateDate(){
            showdate.setText("当前日期:"+year+"-"+(month+1)+"-"+day);
        }
    };
}
